CN103442966A - Steering device for tractor - Google Patents
Steering device for tractor Download PDFInfo
- Publication number
- CN103442966A CN103442966A CN2012800143748A CN201280014374A CN103442966A CN 103442966 A CN103442966 A CN 103442966A CN 2012800143748 A CN2012800143748 A CN 2012800143748A CN 201280014374 A CN201280014374 A CN 201280014374A CN 103442966 A CN103442966 A CN 103442966A
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- Prior art keywords
- wheel
- cylinder
- turns
- trac
- steering
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D7/00—Steering linkage; Stub axles or their mountings
- B62D7/06—Steering linkage; Stub axles or their mountings for individually-pivoted wheels, e.g. on king-pins
- B62D7/08—Steering linkage; Stub axles or their mountings for individually-pivoted wheels, e.g. on king-pins the pivotal axes being situated in a single plane transverse to the longitudinal centre line of the vehicle
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D5/00—Power-assisted or power-driven steering
- B62D5/06—Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle
- B62D5/07—Supply of pressurised fluid for steering also supplying other consumers ; control thereof
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01B—SOIL WORKING IN AGRICULTURE OR FORESTRY; PARTS, DETAILS, OR ACCESSORIES OF AGRICULTURAL MACHINES OR IMPLEMENTS, IN GENERAL
- A01B69/00—Steering of agricultural machines or implements; Guiding agricultural machines or implements on a desired track
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D7/00—Steering linkage; Stub axles or their mountings
- B62D7/06—Steering linkage; Stub axles or their mountings for individually-pivoted wheels, e.g. on king-pins
- B62D7/08—Steering linkage; Stub axles or their mountings for individually-pivoted wheels, e.g. on king-pins the pivotal axes being situated in a single plane transverse to the longitudinal centre line of the vehicle
- B62D7/10—Steering linkage; Stub axles or their mountings for individually-pivoted wheels, e.g. on king-pins the pivotal axes being situated in a single plane transverse to the longitudinal centre line of the vehicle with single-output steering gear
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D7/00—Steering linkage; Stub axles or their mountings
- B62D7/20—Links, e.g. track rods
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D9/00—Steering deflectable wheels not otherwise provided for
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Life Sciences & Earth Sciences (AREA)
- Soil Sciences (AREA)
- Environmental Sciences (AREA)
- Steering-Linkage Mechanisms And Four-Wheel Steering (AREA)
- Guiding Agricultural Machines (AREA)
- Arrangement And Driving Of Transmission Devices (AREA)
Abstract
The present invention relates to a steering device for a tractor, for rotating the front wheels of a tractor, and more specifically, to a steering device for a tractor for enabling the front wheels to be steered to rotate at wider than or close to a perpendicular direction in front of the tractor, by means of a driver controlling a steering handle, and for enabling a wider steering angle of the front wheels and smoother rotation of the front wheels, thereby allowing the tractor to rotate while being in a stationary position so as to perform various tasks in a narrow space or requiring stationary rotation.
Description
Technical field
The present invention relates to make the steering hardware of trac. of the front-wheel rotation of trac., more particularly, the steering hardware that relates to following trac.: the operation of the steering handwheel by the driver, the front-wheel that makes described trac. with more than the vertical direction that can be rotated to described trac. the place ahead or the mode that approaches vertical direction turn to, thereby described trac. can rotate in original place, for can carry out need to be in narrow place or the various operations such as operation that are rotated of original place, make the steering angle of described front-wheel become larger, described front-wheel is more mildly rotated.
Background technology
Usually, trac. is to utilize tractive force and the operation automobile that carries out various operations in agricultural or construction field, current agrimotor generally arranges the place ahead loader forwardly, and carrying, unloading, loading etc. are carried out in various operations various operations with annex are installed on this loader, and by the rear connecting rod, the operation that rotovator etc. carries out ploughing and weeding etc. is installed in section in the wings.
The power that agrimotor described above will produce from driving engine is divided into following power: the running device power of required wheel travelling by actuator drives; With for drive installation at the PTO(Power of the working rig of the various kinds of trac. take off) be power.Described running device power is generally the four wheel drive mode.
Drag gear in the past becomes, along with the driver rotates steering handwheel to clockwise direction and anticlockwise direction, described front-wheel passes through steering hardware and left rotation and right rotation, and in described front-wheel axletree and the direct coupled mode of described front-wheel, there are the following problems: when rotating described steering handwheel to greatest extent, more than the anglec of rotation of described front-wheel can not reach 60 degree, even rotate to greatest extent described steering handwheel, also the minimum radius of rotation due to described trac. becomes large, trac. rearward during conversion direction, need to be moved forward and backward again and again wanting.
Trac. as above need to travel trac. or rotate according to operating environment or job content, but as described above long due to the minimum radius of rotation of trac. and need in the situation that narrow place or original place be rotated, can not be tackled it, exist and can not successfully carry out the problem of operation thus.
Summary of the invention
Technical task
The present invention researches and develops for the problem that solves conventional art as above, the object of the invention is to, provide the steering hardware of following trac.: the operation of the steering handwheel by the driver, the front-wheel that makes described trac. with more than the vertical direction that can be rotated to described trac. the place ahead or the mode that approaches vertical direction turn to, thereby described trac. can rotate in original place, for can carry out need to be in narrow place or the various operations such as operation that are rotated of original place, make the steering angle of described front-wheel become larger, described front-wheel is more mildly rotated.
Solve the problem means
Steering hardware at the trac. for realizing above-mentioned purpose, this steering hardware is by turning to cylinder to make the front-wheel rotation of trac., the described cylinder that turns to is accepted to operate by driver's steering handwheel the steering effort turned to hydraulic way, the steering hardware of described trac. is characterised in that, describedly turn to cylinder to possess to turn to cylinder main body and from the described flexible pair of right and left piston rod in cylinder main body left and right that turns to, and with front-wheel wheel hub direction side by side on this front-wheel wheel hub, across certain intervals, arrange, the both ends of described pair of right and left piston rod respectively with the swing arm chain connection, form thus the four joint bar linkage structures that swing by the described expanding-contracting action that turns to cylinder, thereby make described front-wheel steering, and the steering hardware of described trac. possesses fixed link, thereby described while turning to cylinder operation, the described cylinder that turns to does not move with respect to left and right directions, and can mobile certain-length with respect to fore-and-aft direction, wherein, one end of this fixed link and described front-wheel wheel hub chain connection, the other end and the described cylinder main body chain connection that turns to.
In addition, the invention is characterized in, described fixed link forms upper and lower two, and one of them is connected with the upper hinge that turns to cylinder main body with described front-wheel wheel hub respectively, and another is connected with the underneath hinges that turns to cylinder main body with described front-wheel wheel hub respectively.
In addition, the invention is characterized in, described four the joint bar linkage structures left and right sides also possess respectively the 2 four the joint bar linkage structure, described the 2 four the joint bar linkage structure by as lower component, forming four joint bar linkage structures: as described in swing arm; Swing arm, it is located at the end of described front-wheel wheel hub and makes described front-wheel rotation; And link rod, one end and described swing arm chain connection, the other end and described swing arm chain connection.
In addition, the invention is characterized in, the steering hardware of described trac. possesses the described device that turns to the steering angle of cylinder of detection, during steering angle more than the described certain limit that turns to cylinder operation being detected, will drive the four wheel drive mode of described front-wheel and trailing wheel to be converted to the differential speed type four wheel drive mode of the difference of the rotating speed of regulating described front-wheel and trailing wheel with same rotational speed.
In addition, the invention is characterized in, detect the described device of the steering angle of cylinder that turns to and be provided with described turning on cylinder direction side by side the guide rail that its two ends are fixedly connected with the both ends of described piston rod respectively, movement along with described piston rod, described guide rail also moves, thereby detects the described steering angle that turns to cylinder by the monitor station that is formed at described guide rail.
In addition, in the steering hardware of trac. of the present invention, this steering hardware is by turning to cylinder to make the front-wheel rotation of trac., the described cylinder that turns to is accepted to operate by driver's steering handwheel the steering effort turned to hydraulic way, the steering hardware of described trac. is characterised in that, describedly turn to cylinder to possess to turn to cylinder main body and from the described flexible pair of right and left piston rod in cylinder main body left and right that turns to, and with front-wheel wheel hub direction side by side on the front-wheel wheel hub, across certain intervals, arrange, be provided with described turning on cylinder direction side by side the guide rail that its two ends are fixedly connected with the both ends of described piston rod respectively, detect the described steering angle that turns to the certain limit of cylinder operation by detecting along with the movement of described piston rod the moving range of mobile described guide rail together.
The invention is characterized in, in the standby part formed with the certain-length depression of a mask of described guide rail, and the limit switch that face contacts with described guide rail is set on described guide rail, in the situation that described guide rail moves, while detecting the part that described limit switch forms through described depression and the signal while breaking away from the part that described depression forms, thereby detect the described steering angle that turns to the certain limit of cylinder operation.
In addition, the invention is characterized in, during steering angle more than the described certain limit that turns to cylinder operation being detected, will drive with identical rotating speed the four wheel drive mode of described front-wheel and trailing wheel to be converted to the differential speed type four wheel drive mode of the difference of the rotating speed of regulating described front-wheel and trailing wheel.
The invention effect
The steering hardware of trac. of the present invention makes the steering hardware of the front-wheel rotation of trac. for the cylinder that turns to of the steering effort that the steering handwheel operation by accepting with hydraulic way by the driver turns to, possess four joint bar linkage structures and make described front-wheel steering at the described both ends of the pair of right and left piston rod of cylinder that turn to, possess and front-wheel wheel hub and the described hinged fixed link of cylinder main body that turns to, described while turning to cylinder operation, the described cylinder that turns to does not move with respect to left and right directions, and can mobile certain-length with respect to fore-and-aft direction, even thereby described front-wheel with more than the vertical direction that rotates to described trac. the place ahead or the mode that approaches vertical direction turn to, also can prevent the described bending that turns to the piston rod of cylinder, there is thus the steering angle that can make described front-wheel and become larger, the effect that described front-wheel is more mildly rotated.
In addition, the steering hardware of the front-wheel that turns to the machine drawing of cylinder rotary mop of the steering effort that the steering hardware of trac. of the present invention turns to for the steering handwheel operation by accepting with hydraulic way by the driver, automatically detect the described steering angle that turns to the certain limit of cylinder operation by simple structure, thereby when the described steering angle that turns to cylinder is that certain limit is when above, the type of drive of described front-wheel and trailing wheel can be converted to AWD(All wheel Drive) type of drive, above or approach on vertical direction and described trac. while rotating in original place thereby even described front-wheel rotates to the vertical direction in described trac. the place ahead, described front-wheel can not pushed the place ahead to because of the spinning movement of described trailing wheel yet, there is thus the effect that can make described trac. more mildly rotate.
The accompanying drawing explanation
Fig. 1 is the overall perspective view of applicable trac. one embodiment of the present invention.
Fig. 2 is that one of applicable trac. of the present invention is wanted the birds-eye view of section.
Fig. 3 is the front view of the steering hardware for trac. of the present invention is described.
Fig. 4 is the details drawing about the actuating device of the part of the front-wheel in the present invention.
Fig. 5 is birds-eye view when front-wheel turns to maximum in a clockwise direction in the present invention.
Fig. 6 (a) and (b) be in the present invention guide rail birds-eye view and front view be set.
Fig. 7 (a) and (b) be the front view that the state when guide rail moves with left side to the right in the present invention describes.
<label declaration >
10: operator's compartment 21: front-wheel
21a: wheel frame 21b: bogie
22: trailing wheel 30: car body
40: crank arm 41: S. A.
50: front-wheel wheel hub 51: the front-wheel differential gear
52: turn to air cylinder support 53: the front-wheel axletree
54: turn to air cylinder connecting rod 61: the gear part shell
62: swing shell 63,64,66: finishing bevel gear cuter
65: bevel gear shaft 67: rotary driving part
68: front wheel spindle connecting portion 71: turn to cylinder
72: piston rod 73: swing arm
74: link rod 75: swing arm
81: fixed link 81a, 81b: chain connection section
82: fixed support 91: guide rail
91a, 91b: protrusion 92: test section
92a: limit switch
The specific embodiment
Below, with reference to accompanying drawing, trac. of the present invention is specifically described.
As shown in Figure 1, an embodiment as applicable trac. of the present invention, operator's compartment (10) with operator's saddle is positioned at the upper left-hand of vehicle body frame (30), with rotatable S. A. (41), is connected and crank arm (40) that can rotate are configured in the space that described operator's compartment (10) is not set and realize balance.; have following structure: described operator's compartment (10) is positioned between the front-wheel (21) of trac. and trailing wheel (22) and the position in left side; side at described operator's compartment (10) forms certain space; in the situation that do not utilize described cranking arm (40) not carry out operation, described cranking arm (40) is configured in described certain space.
In addition, the place ahead in vehicle body frame (30), the place ahead of the front-wheel wheel hub (50) that turns to cylinder (71) to be located to take in front-wheel axletree (53), described front-wheel axletree (53) is with the upwards configuration of wheel upper level of described front-wheel (21), the described cylinder (71) that turns to possesses pair of right and left piston rod (72), this pair of right and left piston rod (72) is accepted to operate by driver's steering handwheel the steering effort turned to hydraulic way, thereby left and right is flexible.
The steering hardware of trac. of the present invention is not limited to the structure consisted of operator's compartment (10), crank arm (40) etc. shown in Fig. 1.
With reference to Fig. 2 to Fig. 5, an embodiment of the steering hardware of trac. of the present invention is described as follows.
The steering hardware of trac. of the present invention be make trac. front-wheel (21) in a clockwise direction or the steering hardware that turns to of anticlockwise direction, be arranged at the place ahead of the front-wheel wheel hub (50) of taking in front-wheel axletree (53).
Described steering hardware forms four following joint bar linkage structures: turn to cylinder (71) on the place ahead and described front-wheel wheel hub (50) direction side by side of front-wheel wheel hub (50), with described front-wheel wheel hub (50) across the certain intervals setting, the both ends of described pair of right and left piston rod (72) respectively with swing arm (73) chain connection, the wherein said cylinder (71) that turns to possesses pair of right and left piston rod (72), this pair of right and left piston rod (72) is accepted to operate by driver's steering handwheel the steering effort turned to hydraulic way, thereby left and right is flexible.Left and right sides at described four joint bar linkage structures possesses respectively the 2 four joint bar linkage structure, thereby makes described front-wheel realize the steering angle of larger described front-wheel, and described front-wheel can more mildly be rotated.
Described four joint bar linkage structures are as follows: an end of described pair of right and left swing arm (73) and front-wheel wheel hub (50) chain connection, the both ends chain connection of the other end and described pair of right and left piston rod (72), thereby, along with the flexible sway of carrying out of described pair of right and left piston rod (72), described pair of right and left swing arm (73) can swing.
Described the two or four joint bar linkage structure consists of following part: described swing arm (73); Swing arm (75), it is located at the end of described front-wheel wheel hub (50) and makes described front-wheel rotation; And link rod (74), one end and described swing arm (75) chain connection, the other end and described swing arm (75) chain connection.
As mentioned above, further at left and right side, append respectively the 2 four joint connecting rod is set on the basis of the 1 four joint bar linkage structure that forms four joint bar linkage structures by possessing the turning to cylinder (71) and a pair of swing arm (73) of described pair of right and left piston rod (72), thereby described front-wheel (21) can turn to larger angle (70～110 degree), in addition at described front-wheel (21) while turning to, it is large that the deflection angle of hand of rotation side front-wheel becomes, the toss about deflection angle of front-wheel of rotating photo diminishes, and therefore can carry out softer rotation.
In addition, as shown in Figure 3, upwards configuration of wheel upper level by described front-wheel axletree (53) and described front-wheel wheel hub (50) with described front-wheel (21), make described steering hardware in a clockwise direction or anticlockwise direction with maximum angle (70～110 degree), while turning to, described front-wheel (21) is not subject to described front-wheel axletree (53) and takes in the interference of the front-wheel wheel hub (50) of described front-wheel axletree.In this case, described front-wheel axletree (53) to described front-wheel (21) transferring power be shaped as shown in Fig. 3, Fig. 5 "
" word shape.
With reference to Fig. 4, the structure that described front-wheel (21) rotarilys actuate when described front-wheel axletree (53) and described front-wheel wheel hub (50) are upwards configured with the wheel upper level of described front-wheel (21) is described.
As shown in Figure 4, the power that front-wheel axletree (53) transmits from described front-wheel differential gear (51) with the horizontal direction transmission to the left and right, finishing bevel gear cuter (63,64) is set in the end of described front-wheel axletree (53), and the power-supply change-over that will be delivered to described front-wheel axletree (53) becomes to act on vertical direction.The bevel gear shaft (65) extended downwards from described finishing bevel gear cuter (64) arranges finishing bevel gear cuter (66) in its bottom, at described finishing bevel gear cuter (66), be engaged with for making the rotary driving part (67) of described front-wheel (21) rotation, thereby make described rotary driving part (67) rotation, described rotary driving part (67) is accommodated in front wheel spindle connecting portion (68).
Gear part shell (61) is set; this gear part shell (61) is connected with an end flange of described front-wheel wheel hub (50) and protects described finishing bevel gear cuter (63,64); and prevent from flowing into from outside impurity etc.; be provided with in the bottom of described gear part shell (61) and swing shell (62), this swing shell (62) is connected with the bottom of described gear part shell (61) with the structure that can rotate by the work of steering hardware.Described bevel gear shaft (65) and described finishing bevel gear cuter (66) and rotary driving part (67) have been taken in described swing shell (62).
Described front-wheel (21) arranges wheel frame (21a) at the inside diameter of wheel, central portion at described wheel frame (21a) arranges bogie (21b), described bogie (21b) is connected with described rotary driving part (67) axle, thereby, along with described rotary driving part (67) rotation, described front-wheel (21) is rotated driving.
On the other hand, as shown in Figures 2 and 3, the described cylinder (71) that turns to possesses an end and described front-wheel wheel hub (50) chain connection, the other end and the described hinged fixed link of cylinder (71) main body (81) that turns to, thereby turn to cylinder (71) when work described, the described cylinder (71) that turns to does not move with respect to left and right directions, and can mobile certain-length with respect to fore-and-aft direction.; the end chain connection of fixed support (82) of one end of described fixed link (81) [chain connection section (81a)] and a side that is fixedly installed on described front-wheel wheel hub (50); the other end [chain connection section (81b)] and a described side chain connection that turns to cylinder (71) main body; thereby the described cylinder (71) that turns to does not move with respect to left and right directions, and can mobile certain-length with respect to fore-and-aft direction.
In addition, described fixed link (81) turns to being connected of cylinder (71) and is configured to upper and lower two with described in order to carry out more reliably described front-wheel wheel hub (50), one of them is connected with the described upper hinge of cylinder (71) main body that turns to described front-wheel wheel hub (50) respectively, and another is connected with the described underneath hinges of cylinder (71) main body that turns to described front-wheel wheel hub (50) respectively.
By possessing structure as above, the steering hardware of trac. of the present invention has following advantage: can mildly tackle that camber angle (camber angle) because of described front-wheel (21) produces, being formed at four joint bar linkage structures of described left and right sides and the inclination of the 2 four joint connecting rod moves, even described front-wheel with more than the vertical direction that rotates to described trac. the place ahead or the mode that approaches vertical direction turn to, also can prevent the described bending that turns to the piston rod (72) of cylinder (71), can make thus the steering angle of described front-wheel (21) become larger, described front-wheel (21) is more mildly rotated.
In the steering hardware of trac. as above, the driver becomes the state as Fig. 4 when steering handwheel is rotated to maximum in a clockwise direction.
As shown in Figure 4, when the driver rotates to be maximum in a clockwise direction by steering handwheel, the inboard wheel (left side wheel in Fig. 7) of described front-wheel (21) rotates to be 90 degree above (90-105 degree), and off-side wheel (right-hand wheel in Fig. 7) also can rotate to be the degree that is less than 90 degree (80-89 degree).The anglec of rotation of the inboard wheel (left side wheel in Fig. 7 and the right-hand wheel in Fig. 8) of described front-wheel (21) is rotated by means of steering hardware together with described off-side wheel (right-hand wheel in Fig. 7 and the left side wheel in Fig. 8), and the maximum anglec of rotation that therefore can rotate according to described off-side wheel is determined.
The maximum anglec of rotation of described inboard wheel and described off-side wheel preferably is defined as described trac. can be with the angle of minimum radius rotation in original place.; according to the wheel width of the described front-wheel (21) of trac. and trailing wheel (22) and length etc. determine to make described trac. can be in original place with the anglec of rotation of the described front-wheel (21) of minimum radius rotation; the anglec of rotation of taking turns for the inboard of described front-wheel (21) thus; under the straight-line travelling state, in 90-105 degree scope, be restricted to special angle, the maximum anglec of rotation of the off-side wheel of described front-wheel (21) preferably is defined as the special angle under the straight-line travelling state, in 80-89 degree scope.
Under these circumstances, while wanting in original place the driver to rotate to the direction (clockwise direction or anticlockwise direction) of oneself expectation, after direction (clockwise direction or anticlockwise direction) the rotation maximum that described steering handwheel is expected to oneself, trac. is travelled, the direction rotation that described trac. can be expected to oneself in original place.
On the other hand, with reference to Fig. 6 and Fig. 7, to detect the described device of the steering angle of cylinder that turns in the steering hardware of trac. of the present invention, describe.
As Fig. 6 (a) (birds-eye view) and (b) as shown in (from the front view of the forward observation of trac.), in the steering hardware of trac. of the present invention, detect the described device of the steering angle of cylinder (71) that turns to and be provided with described turning on cylinder (71) direction side by side the guide rail (91) that its two ends are fixedly connected with the both ends of described piston rod (72) respectively, along with described piston rod (72) because of the described work sway that turns to cylinder (71), described guide rail (91) also moves, central portion at described guide rail (91) is provided with the guiding element for preventing that described guide rail (91) from rocking, the test section (92) that detects the moving range of described guide rail (91) is fixedly installed on the described cylinder (71) that turns to.
In the standby part formed with the certain-length depression of a mask of described guide rail (91), breaking away from the part that described depression forms, on the dual-side interface of depression, be not formed with respectively protrusion (91a, 91b).Inside at described test section (92) arranges the limit switch (92a) contacted with a face of described guide rail (91), in the situation that described guide rail (91) is mobile, while detecting the part that described limit switch (92a) forms through described depression and the signal while breaking away from the part that described depression forms, thereby detect the described steering angle that turns to the certain limit of cylinder (71) work.In Fig. 6 and Fig. 7, although used limit switch (92a) as the detecting unit of the moving range that detects described guide rail (91), so long as detect the detecting unit of the moving range of described guide rail (91), use any detecting unit all can.
Below with reference to (a) of Fig. 7 and (b), to by detecting the described device that turns to the steering angle of cylinder (71) as above, detecting the described process of the steering angle of cylinder (71) that turns to and describe.
Fig. 7 (a) illustrates following state: in the situation that the driver turns to certain limit in a clockwise direction by steering handwheel, with hydraulic way, accept to operate steering handwheel and the cylinder (71) that turns to of the steering effort that turns to extend the left side of piston rod (72) and makes the right side contraction of described piston rod (72) and mobile piston bar (72) by described driver, thereby, along with described piston rod (72) is mobile, move to the left with the described guide rail (91) that the both ends of described piston rod (72) are fixedly connected with respectively at two ends.At described guide rail (91) while moving to the left, the limit switch (92a) contacted with a face of described guide rail (91) first contacts with the part formed from described guide rail (91) depression, with the boundary surface of depression not, be that protrusion (91a) contact again afterwards, now described limit switch (92a) produces described guide rail (91) and moves to the signal (ON/OFF) more than certain limit and pass to test section (92).
Fig. 7 (b) illustrates following state: in the situation that the driver turns to certain limit by steering handwheel with anticlockwise direction, with hydraulic way, accept to operate steering handwheel and the cylinder (71) that turns to of the steering effort that turns to extend the right side of piston rod (72) and makes the left side contraction of described piston rod (72) and mobile piston bar (72) by described driver, thereby, along with described piston rod (72) is mobile, move to the right with the described guide rail (91) that the both ends of described piston rod (72) are fixedly connected with respectively at two ends.At described guide rail (91) while moving to the right, the limit switch (92a) contacted with a face of described guide rail (91) first contacts with the part formed from described guide rail (91) depression, with the boundary surface of depression not, be that protrusion (91b) contact again afterwards, now described limit switch (92a) produces described guide rail (91) and moves to the signal (ON/OFF) more than certain limit and pass to test section (92).
By thering is structure as above, the steering hardware of trac. of the present invention automatically detects described guide rail (91) by described test section (92) and has moved the above signal of certain limit, thereby can automatically detect the described above steering angle of certain limit that turns to cylinder (71) work.
When the above steering angle of the described certain limit that turns to cylinder (71) work being detected (when the detection by shown in Fig. 6 and Fig. 7 is described while turning to the structure of device of steering angle of cylinder or other structures the described steering angle turned to more than the certain limit that cylinder (71) works to be detected), when described front-wheel steering certain limit being detected when above, for prevent described trailing wheel due to and described front-wheel between the difference of driving rotating speed promote the phenomenon of described front-wheel, from the rotating speed with identical, drive the four wheel drive mode of described front-wheel and trailing wheel to be converted to the differential speed type four wheel drive mode of the difference of the rotating speed of regulating described front-wheel and trailing wheel, thereby automatically regulate the driving rotating speed of described front-wheel and trailing wheel.
On the other hand, describedly turn to cylinder (71) in the situation that described front-wheel turns in certain limit from turning to more than certain limit to become, described limit switch (92a) contacts with the part that the depression of described guide rail (91) forms, under these circumstances, the type of drive of described front-wheel and trailing wheel is converted to the four wheel drive mode that drives described front-wheel and trailing wheel with same rotational speed.
There is thus following advantage: even described front-wheel is above or approach vertical direction according to turning to cylinder to rotate to the vertical direction in trac. the place ahead, thereby described trac. rotates in original place, described front-wheel can not force to push to the place ahead according to the spinning movement of described trailing wheel yet, can carry out softer rotation thus.
Above, with reference to the preferred embodiments of the present invention, be illustrated, but those skilled in the art should be understood that in the scope that does not break away from thought of the present invention that claims put down in writing and field and can carry out various modifications and changes to the present invention.
Claims (8)
1. the steering hardware of a trac., this steering hardware is by turning to cylinder to make the front-wheel rotation of trac., the described cylinder that turns to is accepted to operate by driver's steering handwheel the steering effort turned to hydraulic way, and the steering hardware of described trac. is characterised in that
Describedly turn to cylinder to possess to turn to cylinder main body and from the described flexible pair of right and left piston rod in cylinder main body left and right that turns to, and with front-wheel wheel hub direction side by side on this front-wheel wheel hub, across certain intervals, arrange,
The both ends of described pair of right and left piston rod respectively with the swing arm chain connection, form thus the four joint bar linkage structures that swing by the described expanding-contracting action that turns to cylinder, thereby make described front-wheel steering,
The steering hardware of described trac. possesses fixed link, thereby described while turning to cylinder operation, the described cylinder that turns to does not move with respect to left and right directions, and can mobile certain-length with respect to fore-and-aft direction, wherein, one end of this fixed link and described front-wheel wheel hub chain connection, the other end and the described cylinder main body chain connection that turns to.
2. the steering hardware of trac. according to claim 1, is characterized in that,
Described fixed link forms upper and lower two, and one of them is connected with the upper hinge that turns to cylinder main body with described front-wheel wheel hub respectively, and another is connected with the underneath hinges that turns to cylinder main body with described front-wheel wheel hub respectively.
3. the steering hardware of trac. according to claim 1, is characterized in that,
Left and right sides at described four joint bar linkage structures also possesses respectively the 2 four joint bar linkage structure,
Described the 2 four joint bar linkage structure is by form four joint bar linkage structures as lower component:
Described swing arm; Swing arm, it is located at the end of described front-wheel wheel hub and makes described front-wheel rotation; And link rod, one end and described swing arm chain connection, the other end and described swing arm chain connection.
4. the steering hardware of trac. according to claim 1, is characterized in that,
The steering hardware of described trac. possesses the described device that turns to the steering angle of cylinder of detection, during steering angle more than the described certain limit that turns to cylinder operation being detected, will drive the four wheel drive mode of described front-wheel and trailing wheel to be converted to the differential speed type four wheel drive mode of the difference of the rotating speed of regulating described front-wheel and trailing wheel with same rotational speed.
5. the steering hardware of trac. according to claim 1, is characterized in that,
Detect the described device of the steering angle of cylinder that turns to and be provided with described turning on cylinder direction side by side the guide rail that its two ends are fixedly connected with the both ends of described piston rod respectively, movement along with described piston rod, described guide rail also moves, thereby detects the described steering angle that turns to cylinder by the monitor station that is formed at described guide rail.
6. the steering hardware of a trac., this steering hardware is by turning to cylinder to make the front-wheel rotation of trac., and the described cylinder that turns to accepts with hydraulic way the steering effort that the steering handwheel operation by the driver turns to,
The steering hardware of described trac. is characterised in that,
Describedly turn to cylinder to possess to turn to cylinder main body and from the described flexible pair of right and left piston rod in cylinder main body left and right that turns to, and with front-wheel wheel hub direction side by side on this front-wheel wheel hub, across certain intervals, arrange,
Be provided with described turning on cylinder direction side by side the guide rail that its two ends are fixedly connected with the both ends of described piston rod respectively,
Detect the described steering angle that turns to the certain limit of cylinder operation by detecting along with the movement of described piston rod the moving range of mobile described guide rail together.
7. the steering hardware of trac. according to claim 5, is characterized in that,
In the standby part formed with the certain-length depression of a mask of described guide rail, and the limit switch that face contacts with described guide rail is set on described guide rail, in the situation that described guide rail moves, while detecting the part that described limit switch forms through described depression and the signal while breaking away from the part that described depression forms, thereby detect the described steering angle that turns to the certain limit of cylinder operation.
8. according to the steering hardware of claim 6 or 7 described trac.s, it is characterized in that,
During steering angle more than the described certain limit that turns to cylinder operation being detected, will drive with identical rotating speed the four wheel drive mode of described front-wheel and trailing wheel to be converted to the differential speed type four wheel drive mode of the difference of the rotating speed of regulating described front-wheel and trailing wheel.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020110025876A KR101233971B1 (en) | 2011-03-23 | 2011-03-23 | Steering Apparatus of Tractor |
| KR10-2011-0025876 | 2011-03-23 | ||
| PCT/KR2012/001961 WO2012128525A2 (en) | 2011-03-23 | 2012-03-19 | Steering device for tractor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103442966A true CN103442966A (en) | 2013-12-11 |
| CN103442966B CN103442966B (en) | 2016-01-13 |
Family
ID=46879881
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201280014374.8A Expired - Fee Related CN103442966B (en) | 2011-03-23 | 2012-03-19 | The steering hardware of trac. |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US8910741B2 (en) |
| JP (1) | JP5747118B2 (en) |
| KR (1) | KR101233971B1 (en) |
| CN (1) | CN103442966B (en) |
| WO (1) | WO2012128525A2 (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ES2691409T3 (en) * | 2011-12-15 | 2018-11-27 | Rheinmetall MAN Military Vehicles Österreich GesmbH | Steering system acting bilaterally for utility vehicles |
| US10597075B2 (en) | 2015-02-18 | 2020-03-24 | Volvo Truck Corporation | Twisted bar for attaching a steering cylinder of a vehicle to a wheel axle, vehicle comprising such a bar and process for manufacturing such a bar |
| CN104724648A (en) * | 2015-03-31 | 2015-06-24 | 浙江鼎力机械股份有限公司 | Aerial work platform with control line protection function |
| CN106314534A (en) * | 2016-08-30 | 2017-01-11 | 合肥常青机械股份有限公司 | Axle steering mechanism for driving wheel through double swing arms |
| CN107826165B (en) * | 2017-10-21 | 2024-02-09 | 雷州雷宝机械有限公司 | Wheel type sugarcane harvester |
| KR102130355B1 (en) | 2020-01-21 | 2020-07-06 | 주금순 | Variable width steering of tractor Wheels |
| US11980125B2 (en) * | 2020-12-18 | 2024-05-14 | Deere & Company | Position detectors for steering systems of agricultural header transport systems |
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| JP4605647B2 (en) * | 2005-03-08 | 2011-01-05 | 株式会社クボタ | Mower |
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2011
- 2011-03-23 KR KR1020110025876A patent/KR101233971B1/en not_active IP Right Cessation
-
2012
- 2012-03-19 WO PCT/KR2012/001961 patent/WO2012128525A2/en active Application Filing
- 2012-03-19 US US14/005,797 patent/US8910741B2/en active Active
- 2012-03-19 CN CN201280014374.8A patent/CN103442966B/en not_active Expired - Fee Related
- 2012-03-19 JP JP2014500990A patent/JP5747118B2/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4566554A (en) * | 1983-05-09 | 1986-01-28 | Nissan Motor Co., Ltd. | Four wheel drive system with center differential unlock control responsive to steering angle |
| US4903789A (en) * | 1987-04-13 | 1990-02-27 | Kubota, Ltd. | Power steering apparatus |
| JPH09226615A (en) * | 1996-02-29 | 1997-09-02 | Nosakubutsu Seiiku Kanri Syst Kenkyusho:Kk | Vehicle for agricultural work |
| CN101873961A (en) * | 2007-11-22 | 2010-10-27 | 丰田自动车株式会社 | Vehicle steering device |
Also Published As
| Publication number | Publication date |
|---|---|
| US20140008885A1 (en) | 2014-01-09 |
| KR20120108226A (en) | 2012-10-05 |
| US8910741B2 (en) | 2014-12-16 |
| CN103442966B (en) | 2016-01-13 |
| WO2012128525A3 (en) | 2012-12-27 |
| KR101233971B1 (en) | 2013-02-21 |
| JP5747118B2 (en) | 2015-07-08 |
| JP2014513000A (en) | 2014-05-29 |
| WO2012128525A2 (en) | 2012-09-27 |
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